Locomotive boiler



C. G. HAWLEY LOCOMOTIVE BOILER Filed May l5 1922 vagano u nanna a Albus nanna.

Patented June 22, 1926.

UNITED STATES I71,589,961 PATENT OFFICE.

CHARLES GILBERT HAWLEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO LOCOMOTIVE FIRE- BOX COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

LOCOMOTIVE BOILER.

Application led May 13, 1922. Serial No. 569,660.

My invention relates to locomotive boilers and the object thereof is to increase the capacity and efficiency of such boilers. To that end lI very considerably increase the firebox heating surface and provide means which cause or set up a positive fore-and aft circulation of the water in the boiler. My invention comprises, in combination with the locomotive irebox, a hollow water table extending transversely across the firebox and in communication with the side water legs of the boiler, plus a substantially triangular vertical hollow wall which rises from the top of the water table portion and extends through the crown sheet of the firebox, presenting therein an outlet opening equalling, and indeed, much exceeding in size the combined intake areas of the water table portion. These and other features of my invention will be readily understood on reference to the accompanying drawing, in which Fig. 1 is a vertical longitudinal section of a locomotive boiler firebox embodying my invention. Fig. 2 is a transverse section thereof substantially on the line 2-2 of Fig. 1. Fig. 3 is a horizontal section substantially on the line 3-3 of Fig. 1 and Fig. 4 is an enlarged sectional detail substantially on line 4 of Fig. 1.

As here indicated, my invention comprises a water-circulating-and-steaming attachment of a kind which may be applied to anyY locomotive boiler firebox already in existence or which may be built into a new firebox. Primarily it is intended for fireboxes of the medium and wide sizes which are of such form as to permit the attachment in its completed form to be hoisted into the firebox through the bottom of the same, when the grate is removed. In the drawings 2 represents the flue sheet of the irebox. 3 is the crown sheet. 4 is the back sheet and 5, 5, are the side sheets of the firebox. The fiues are marked 6. The dotted line 7 represents the normal grate surface. It will be understood that the firebox is secured to and supported from the shell 8 of the boiler by means of the usual longitudinal and transverse rows of stay-bolts. The long radial or crown bolts are marked 10; and the short water leg stay-bolts are marked 11.

My novel attachment comprises the rearwardly and upwardly inclined hollow water table portion A and the vertical water wall portion A. The table portion is substantially rectangular and is stay-bolted throughout, as is well shown in the drawing. The vertical portion A is of substantially triangular form, beginning at the lower front end of the portion A and rising thence to the crown sheet. Thev bottom 12 of the rear part of the portion A is inclined upwardly and rearwardly in the form of an extension or continuation of the inclined water table portion. By this form l avoid the possibility of trapping mud or sediment in either part of the attachment. The portion A is stay-bolted throughout as indicated. The water 'table contains a water space 13 of about one-half the width of the water space 14 in the part A; and the length of the water table is preferably about onehalf the length of the open top` of the water wall A. Thus I provide both an ample intake area for the device and an ample outm let area. The ends of the water table are joined to the edges of opening 16 in the side sheets 5, 5, preferably by means of elongated diaphram (corrugated) attachment plates 17, as well shown in Fig. 4. For the eifective strengthening of these connections ll dispose therein two of the rows of stay-bolts 11. The top of the attachment is applied to the crown sheet in a manner substantially identical with that shown in Fig. 4, though it may quite well be directly attached to the edges of the complementary opening in the crown sheet.

All flanges and curves of the device are well rounded to avoid abru t angles, as best indicated at points 18 in Figs. 2 and 4.

It should be noted that the lower front end or edge of the hollow water table is widely spaced from the Hue sheet 2, my purpose being to avoid localizing expansion and contraction strains in the neighborhood of the iiue sheet. The space between the two parts is normally closed by a transverse row of firebrick 19, as well shown in Figs. 1 and 3.

The water table portion of this device forms an admirable ire arch in the irebox and the extensive vertical water wall not only provides an ample circulation of water through the water table, but also serves to further sub-divide the flame body in the irebox with obvious advantages.

In operation the device causes a vigorous fore-and-aft circulation of the boiler water with marked improvement in the eiiicicncy of all of the heating surfaces of the boiler.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In combination with a locomotive firebox having a crown sheet and side sheets, a water steaming and circulating element arranged in the irebox and embodying therein, a vertically disposed flat tubular water leg arranged longitudinally of the firebox and having an elongated discharge mouth opening through the crown sheet and a rearwardly and upwardly-inclined bottom wall, said element also including a flat tubular water table extending transversely7 of the ireboX with an inlet at each end which opens through the side sheets of the rebox, said water table being inclined in the angle of the bottom wall of the water leg and communicating therewith at the bottom end thereof.

2. A locomotive boiler firebox having a flue sheet in combination with an upwardly and rearwardly inclined stay-bolted water table portion extending transversely across said box and at the ends in communication with the side water legs of the firebox, a

substantially triangular stay-bolted vertical water wall extending between said water table and the crown sheet of the irebox and providing an ample circulatory outlet for said water table, both said table portion and said vertical portion being spaced rearwardly from the lue sheet, and a refractory brick arch extending between the Jforward edge of thel water table and the flue sheet.

3. A water steaming and circulating element for locomotive boilers and adapted to be located in the fireboX thereof and comprising a vertically disposed flat tubular, triangularly shaped water leg having an elongated top opening and an inclined bottom wall, and a flat tubular Water table arranged transversely of the water leg and in the inclined plane of the bottom wall of said water leg and with which it communi- Cates7 said water table having inlet openings at its ends, the planes of said water leg and table being disposed at a right angle to each other.

4 In testimony whereof, I have hereunto set my hand this 6th day of May, 1922.

CHARLES GILBERT HAWLEY. 

